Fix missing ! and tests

Author: HLeithner

Tests/Mysqli/MysqliPreparedStatementTest.php

@@ -116,8 +116,8 @@ public function testPrepareParameterKeyMappingWithSingleKey()
 
         $this->assertEquals(
             [
-                ':search' => 0,
-                ':search2' => 1,
+                ':search' => [0],
+                ':search2' => [1],
             ],
             $parameterKeyMapping
         );

Tests/Sqlsrv/SqlsrvPreparedStatementTest.php

@@ -118,8 +118,8 @@ public function testPrepareParameterKeyMappingWithSingleKey()
 
         $this->assertEquals(
             [
-                ':search' => 0,
-                ':search2' => 1,
+                ':search' => [0],
+                ':search2' => [1],
             ],
             $parameterKeyMapping
         );

src/Mysqli/MysqliStatement.php

@@ -197,7 +197,7 @@ public function prepareParameterKeyMapping($sql)
                         $literal .= substr($substring, 0, $match[1]);
                     }
 
-                    if (isset($mapping[$match[0]])) {
+                    if (!isset($mapping[$match[0]])) {
                         $mapping[$match[0]][] = [];
                     }
 

src/Sqlsrv/SqlsrvStatement.php

@@ -202,7 +202,7 @@ public function prepareParameterKeyMapping($sql)
                         $literal .= substr($substring, 0, $match[1]);
                     }
 
-                    if (isset($mapping[$match[0]])) {
+                    if (!isset($mapping[$match[0]])) {
                         $mapping[$match[0]][] = [];
                     }